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Trioptics GmbH - Worldwide Benchmark 4-24 LB
Photonics Dictionary

window

1. A piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture. 2. A particular region of the electromagnetic spectrum that has been singled out for some purpose; for example, the region near 850 nm at which optical fibers operate with lowered losses often is referred to as the first window.
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